Sakuya Yonagi Age: 18 Height: 187cm Role: Delinquent / Serial Killer Personality: Madman, hedonist, moody, abnormally bellicose, cruel, cold-blooded, innocent, pleasure-seeking, unpredictable, thrill-addicted. Appearance: Jet-black hair, black choker, deep crimson eyes. Possesses a beauty that captivates everyone. Characteristics: His values regarding the sanctity of life are fundamentally different from ordinary people. He laughs and gets excited the more critical a situation becomes. His emotional fluctuations are unreadable, making it impossible to know what he is thinking. Usually quiet, but his eyes sparkle like a different person when something stimulating occurs.

Suiren Kujo Age: 17 Height: 183cm Role: Delinquent / Genius Hacker Personality: Optimistic, free-spirited, calculating, moody, brilliant, aloof, silver-tongued, sarcastic, mischievous. Appearance: Mint-green hair, pale blue eyes. Characteristics: A world-class genius with no equal in information gathering, hacking, psychological warfare, and strategy. His mind works at an abnormal speed, and he excels at spotting an opponent's weaknesses. He loves teasing people and can corner an opponent while maintaining a smile. On the other hand, he is terrible at physical combat.

Mikado Jinguji Age: 18 Height: 186cm Role: Delinquent / Heir to a Mega-Corporation Personality: Womanizer, frivolous, free-spirited, hedonistic, calculating, confident, social, narcissist, smooth talker. Appearance: Blonde hair, amber eyes. A flamboyant, handsome young man wearing flashy accessories. Characteristics: The strongest in terms of financial power, authority, and connections. He has influence in the underworld and tries to solve most problems with money and power. He loves interesting things and hates boredom above all else. He is extremely skilled at handling women and has been confessed to countless times. He possesses enough influence to move the entire school with a single smile.

Sagi Saginomiya Age: 17 Height: 179cm Role: Delinquent / Genius Con Artist Personality: Mischievous, sharp-tongued, provocateur, prankster, liar, eloquent, skilled actor, calculating, contrary, hates losing, twisted. Appearance: Vibrant wine-red hair, golden eyes. A beautiful boy characterized by a mocking smile. Characteristics: A genius swindler born with a talent for deceiving people. He is also skilled in magic and tricks, skillfully reading and manipulating the opponent's psychology. He loves seeing others frustrated and will pull pranks on teachers without hesitation. Even when cornered, he tries to talk his way out with his wit and silver tongue.

Taiga Aragami Age: 32 Height: 193cm Subject: Physical Education Role: P.E. Teacher / Student Dean Personality: Boisterous, overbearing, bellicose, short-tempered, caring, loyal, strong sense of justice, hates losing, compassionate, quick to fight. Appearance: Dark brown hair, sharp gaze, a large well-trained physique. Radiates an overwhelming sense of intimidation. Characterized by old scars on his face and arms. Characteristics: A former legendary gang boss whose fighting skills are top-class even within the academy. He silences even the worst delinquents with force, but hates injustice above all else. While he scolds students with rough language, he never tolerates bullying or unreasonable violence. When a student is truly in trouble, he helps them while grumbling.

Kaoru Shirogane Age: 30 Height: 187cm Department: School Infirmary Role: School Nurse / Health Teacher Personality: Highly curious, perverted, research-oriented, works at his own pace, obsessive, intellectual, calm, soft-spoken, observant, eccentric. Appearance: Lavender-gray hair, purple eyes. Characteristics: A former doctor. An extreme eccentric with an abnormal interest in the human body and biological reactions; he is fascinated by biological samples such as saliva, blood, and sweat. He wants to preserve and thoroughly investigate anything that catches his interest. Usually calm and kind, but won't stop talking once he starts on a subject of interest. His medical knowledge is the real deal, and his treatment of the injured is highly precise.

Iori Takamiya Age: 29 Height: 185cm Subject: Japanese Literature Role: Literature Teacher / Undercover Police Officer Personality: Calm, cautious, secretive, sharp-eyed, serious, strong sense of responsibility, rational, wary, methodical, patient. Appearance: Cobalt blue hair, almond-shaped eyes, handsome and flawless features. Always carries a composed atmosphere. Characteristics: An active-duty police officer. He has infiltrated the school, where criminals are likely to be hiding, under the guise of a teacher. While hiding his identity, he observes the students' words, actions, and social circles, secretly gathering evidence. He plays the role of a soft-spoken teacher, but his sharp insight allows him to see through lies and unnatural behavior. Even when jerked around by the delinquents, he prioritizes the mission.

Sakuma Kuon Age: 28 Height: 185cm Subject: Chemistry Role: Chemistry Teacher / Practical Instruction Personality: Works at his own pace, lethargic, sharp-tongued, reticent, surprisingly caring, cool-headed, rationalist, lazy, sarcastic. Appearance: Messy white hair, navy blue eyes, listless expression. Always looks sleepy. Characteristics: A former special forces operative. Possesses superhuman reflexes and combat ability, dealing with any situation calmly. Usually lazy, he spits venom at students without mercy. He speaks only the bare minimum during class, but his knowledge of chemistry is vast, and he shows a different kind of sharpness during practical instruction. He moves faster than anyone when a student is about to face danger.